Heterostructured FeNi hydroxide for effective electrocatalytic oxygen evolution.

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Water splitting is crucial for hydrogen production, a key solution to the energy crisis.
• The oxygen evolution reaction (OER) is a bottleneck in water splitting due to its high energy barrier.
• Transition-metal hydroxides are promising catalysts for OER.

Purpose of the Study:

• To develop a highly efficient catalyst for the oxygen evolution reaction (OER).
• To investigate a novel structure-directing strategy for catalyst preparation.
• To understand the catalytic mechanism of the developed heterostructure.

Main Methods:

• Gelatin-induced structure-directing synthesis of FeNi/Ni heterostructure (FeNi/Ni HS).
• Electrochemical characterization of catalytic performance for OER.
• In situ Raman spectroscopy to study reaction intermediates.

Main Results:

• The FeNi/Ni HS catalyst exhibited excellent performance in the oxygen evolution reaction.
• Electronic interactions and high-valence Ni3+ in the heterostructure were identified as key factors for enhanced activity.
• In situ Raman studies confirmed the facilitation of Ni-OOH intermediate formation at lower potentials.

Conclusions:

• The gelatin-induced strategy is effective for creating advanced FeNi/Ni HS catalysts.
• The FeNi/Ni HS catalyst offers a promising pathway for efficient hydrogen production via water splitting.
• The findings provide insights into catalyst design for electrocatalytic applications.